Sets and Maps

 Sets and Maps

Sets and Maps are built-in data structures introduced in JavaScript that provide efficient ways to store unique values and key-value pairs, respectively.

// Set example

const mySet = new Set();

mySet.add(1);

mySet.add(2);

mySet.add(3);

console.log(mySet.has(2)); // Output: true

console.log(mySet.size); // Output: 3

// Map example

const myMap = new Map();

myMap.set('name', 'John');

myMap.set('age', 30);

console.log(myMap.get('name')); // Output: John

console.log(myMap.size); // Output: 2

Sets store unique values, allowing you to add, check for existence, and retrieve elements efficiently. Maps store key-value pairs and provide methods to set, get, and delete values based on the keys.